Why won't my iPhone send or receive pictures?

I have the I phone 4 and iOS 6 but my phone for some reason won't let me send or receive pictures through texts it hasn't let me for a while now (6-7 months) but now it won't even let me receive pictures what can I do to fix this?

Talk to AT&T or your service provider.iOS 6 has not been the best program and it has been messing up a lot of peoples phones

Call your carrier, it may be related to them, not the phone. Also turn imsg on and try that too.

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